Variable-speed mechanism.



H. W. SGHATZ. VARIABLE SPEED MEGHANISM. APPLICATION FILED DEO.28,1908

Patented Apr. 2

2 sums-sum 1.

WITNESSES:

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20, 1909. 2 SHEETS-SHEET 2.

nisrfrnn stares PATENT ent ies.

HERM

W. SQI-IAIZ, OF GINCIN NATI, OHIO, ASSIGNOR TO THE AMERICAN TOOL WORKS ()Oli'lTANY, OF CINCINNATI, 01110, A (I)RPQRANUN OF WEST VIRGINIA. i

Application filed December 28, 1908. Serial No. 469,571.

To all whom it may concern:

1 Be it known that], HEnMAN W. SonA'rz, a citizenof the United States, residing at Cin- Qinnati, in the county of Hamilton and State of Ohio, have invented certain new and. use

ful Improvements in V ariable-Spced Mech-.

anism, of which thefollowing is a specification. i z I LMyinvention relates to an improvement in the feed mechanism for a machine tool.- Theobject of the invention is to provide an ample range of feeds within a compact com-pass, and preferably within a fccdbox in which the parts can be conveniently and cheaply assembled and thenbolted. as a unit to the frame. i

, Another; object of myinvention is to provide an arrangement of such a wide speed range, that it Willsatisfy all of the requirements in this direction, without having to depend upon-speeds derived from the compound effect of several variable speed systems disposed at different points in the machine organization, as is commonly done in standard tools of today.

. Another object, ofthc invention is to provide 'a feed-box and a change gear system, adaptable without. substantial modliication,

to the requirements of either of the metric or domestic scales.

The features of the invention are more fullyset forth in the description of the accompanying drawings, forming a part of this specification, in which:-

' Figurel is a central vertical section; through my improvement. Fig. 2 is a sectional view through the shifting tumbler mechanism. (Figs. 1 and 2 illustrate the gearing arrangement fora metricsys tcm.) Fig. 3 is a side elevation of my improven'icntas applied to a lathe and in an arrangement for a domestic system, Fig. 4 is a front elevation of the same. Fig. 5 is an enlarged section on line i), c, Fig. a Fig. 6 is a section on line m, m, Fig. 5. Fig. 7 is a section on line 11, Fig. 6. Fig. 8 is a section on line w, Fig. 5.

Fig.9 isa section on line a, a, Fig. 6. Thus it will beseenthat Figs. land 2 represent the metric system and theremainder the domesc sys em 1'is thefeed bOX in which is journ aled within suitable bearings the tumbler shaft 2 3, (Fig. -7-the domestic system), is'the gear fixed on shaft 2, outside ofthebox, driven by the train of gears 4, V latte Specification of Letters'Patent.

'lationship of the drivin Patented April 20, 1909 being an intermediate in the train and adjustable/ on the made remova 1e thus permitting of change mountings if desired. 2 1 Upon shaft 2 is mounted theordinary tumbler 7, projected through the casing slot 8, said tumbler carrying the pinion H, sliding on and turning with shaft 2,.and the gear 10 for driving the cone. "mo. r

11 represents the cone bearing shaft mountedv in suitable bearings formed in the box 1.

12 is. the cone of gears in the metric system, (Fig. 1);'it is fixed to sleeve 13 loose on shaft 11. In the domestic system, (Fig. 5), the cone is fixed directly to shaft 1 l.

. 14, 15, is the compound gear member, the

uadrant 6, gears and 4 are gears being spaced apart and connected by I 26, loose on shaft 11, 40 being a gear on the outer end of this sleeve 26 for transmitting the motion from thc'variable speed box.

In the metric system (see Figs. 1 and 2) the driving gear 3 is on the outer end of shaft 1], the driven element being the tumbler shaft 2; In the domestic system-(sec Figs. 5 and 7), thedriving gear 3 is on the tumbler shaft 2 and the sleeve 26 is thedrivcn element.

It is to be understood that in the standard domestic system of screws there are so many threads to the inch, while in the metric system the threads have standard millimeter pitches. The pitch of the lead screw will be different in domestic and metric system lathes. 1n the domestic system illustrated herein, the driver being the tumbler shaft and sleeve 26 the driven element, will give a different ratio of speeds between the spilldle and lead screw than is obtainable from the metric system, in which, the member 14, 15, is the driving element and .ne tumblersh'aft the driven element.

My invention has important manufactun ing advantages in that the parts and the organization are substantially the same'in both systems, except that in assembling the reand the driven members ischangcd by se ecting which shall be the fixed and which theloose gears and by transposing. the relationship of the driving anddrivenniembers, whichinatters will be readilynnderstood, icy-mechanics skilled in l art ,fwnnthis description. Thus it is ap parent that the organizations are the same in principle for themetrie and domestic systems, and only differ in the order of the drive, and the relative fixidity and looseness of the elements on shaft 11, in one case the cone of gears being loose on the shaft'with the compound gear member fixed to said shaft, while in the other case the cone is fixed to the shaft while the compound gear member is loose on the shaft. The cone is always an intermediate element of both systems, that is, comound gear member 14, 15, is the driver in ig. 1, the tumbler the driven and the cone an intermediate element of the train; in Fig." 5, the tumbler is the driver, compound gear" member 14, 15, the driven and cone 12 an intermediate element of the train. 16represents a counter shaft journaled in suitablebearings formed in the box. Upon it is mounted gear 17, formed with a sleeve 18, having the end clutch teeth 19; gear 17 meshing with the smallest gear of the cone, 20 represents a gear formed with the sleeve 21, having clutch teeth 22. Said gear 20 meshing with the"largest.gea1 of the cone. Sleeves 18 and 21 are loose relative to shaft 16, but may be alternately fixed .thereto, by

' shifting the double clutch member 23, fixed to shaft 16, intermediate the clutch members 19 22. I

24, 25, represents a compound gear member splineddirectly to shaft 16, with the member 24, adapted to be meshed with the gear 15, on shaft 11, and the gear 25, adapted to be meshed with the ear 14, on shaft-11, -In operation, it will lae understood, that the tumbler is manipulated in the usual way to engage gear 10 selectively with the individua members of the cone 12. Assume the tumbler gear 10 is intermeshed with a selected gear of the cone, if now, clutches 19, 23, areengaged, and gears 24, 15; shaft 11 is driven at one speed; if new, gears 25, 14, are engaged, another speed is obtainable with the tumbler in the same position. For shifting the clutch 23 and the com- {pound sliding gears 24, 25, I provide the rock arms and rock shaft mechanism 28, having the handle detents 29 in usual form, properly indexed. If now, clutch Inembers 22, 23, be engaged, the s lined compound gear members 24, 25 may 0 shifted relative to gears 14, 15, to derive two more speeds, so that four different s' eeds are thus de rived from the system with the tumbler in a fixed position. Of course, by the recourse f to the tumbler system a range of speeds may be obtained equal to four times the number of ears comprised in the cone.

' is an additionalconvenience of this box, it will be observed that the three levers for manipulating the tumbler, slide-gear and slide-clutch elements project conveniently from the front of the box in position to be admirably indexed and to be easily manipulated by the operator in his customary position with reference to the tool. Having described my invention, I claim 1. A pair of shafts, a cone of gears and a second gear member one member being loose the other being fixed on the first shaft a pair of gears loose on the second shaft and intermeshcd with two of the gears of the cone, means for clutching said gears alternatively to the second shaft, a third gear member fixed to the second shaft and meshing with the second gear member of the first shaft, a tumbler shaft and a. tumbling gear driven therefrom adapted to intermesh with the gears of the cone. 2. A pair of shafts, a cone of gears and a second compound gear member, one being loose and the other being fixed on the first shaft, a pair of gears loose on the second shaft and intermeshed with two of the gears of the cone, means for clutching said gears alternatively to said second shaft, a third compound gear rotatively fixed to the second shaft its elements 'bein adapted to be intermeshed selectively wit] the elements of the second compound gear member of the first shaft. 1

3. A pair of shafts, a sleeve loose on the first shaft, a cone of gears and a second comound car member one bein fixed on the sleeve and the other on the first shaft a pair of gears loose on the second shaft and intermeshed with two of the gears of the cone,

4. A pair of shafts, a sleeve loose on the first'shal't, a cone of gears and a compound gear member one bein fixed on the slccve and the other on'the rst shaft, apair of gears loose on the second shaft and intermcshed with tuo of thegears of the cone, means for clutching said earsalternatively to said second shaft, a third compound gear member fixed to the second shaft its elements being adapted to intermesh respectively with the elements of the second compound gear mbmber of the first shaft, and means for shifting one of the said compound gear members to make alternative intermcshes whereby four speeds may be taken from each elementof the cone.

In testinumy whereof, I'have hereunto set my hand. 

